whirlpool LAC4900K5 (compact/portable) not draining

I posted to your forum back in 2005 when we replaced the drive belt on this washer. (Whirlpool LAC4900K5 - compact/portable) Now it won't drain. The belt seems to still be in pretty good shape. The manual said it could be the manifold trap. It doesn't show where the trap is on this model, or even if there is one.

I removed the pump and there was a small round plastic part that seemed to be clogging it. The drive belt was loose enough that I was able to pull it off the pump and then put it back on the pump when I reinstalled it. I was thinking the belt shouldn't be that loose? Maybe that's why it wasn't draining, but I wonder what that plastic part was. This is a picture of it next to an electric outlet (didn't have any quarters.)

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Also I'm wondering what would be the best choices for a new washer? I would like to get one that is easy to repair and to get parts for. (I found someone that has replacement parts for this one. The pump would go for around $80 with shipping.)

That might be a rubber sealing surface from the flapper valve inside the pump, (It's been a long time since I look at a belt drive pump), it appears to be the size of the outlet or inlet on the pump and may have worn thru and cutout that circle from the sealing surface on flapper valve.

Other than that, I'm not sure where it would have came from.

The belt shouldn't be able to be too loose unless it has stretched quite a bit, (which these multi-rib belts don't really stretch out), there is an idler tension pulley that should keep the correct tension on the belt.

The round black thing in the picture is NOT what was in your pump. That is the black plastic/multi-rib pulley for use on the compact machine that you have. You have to remove the v-belt pulley that comes on the pump and replace it with the multi-rib pulley.

Look inside the pump and operate the lever. It should snap back and forth smoothly. Verify the flap inside is moving. I think the picture you showed was the broken flap though. The repair kit for that drain sump instructed you to cut the sump and replace it with a new one that was held on by a large hose clamp. Not sure if they are still available, usually you could pick out any clogs. If you purchase a new pump you will need to change the pulley. Insert a rod into the new pump through one of the large ports until it locks the impeller so you can spin off the old pulley.

It is called the world washer. A less than memorable platform. I would try to find a compact direct drive model, also out of production.I wouldnt even think about repairing that first machine. Its pretty well roached.